Operating mechanism for screens.



N0. 807,475. PATENTED DEC. 19, 1905. J. E. LB BOSQUET & T. BELL.OPERATING MECHANISM FOR SCREENS.

APPLICATION FILED PEB.10.1905.

2 SHEETS-SHEET l.

w; hmoom No. 807,475. PATENTED DEC. 19, 1905.

J. B. LB BOSQUET & T. BELL. OPERATING MECHANISM FOR SCREENS.

APPLICATION FILED FEBJO. 1905.

2 SHEETS-SHEET 2.

UNITED STATES PATENT OFFIQE.

JOHN E. LEBOSQUET, OF SOUTH MCALESTER, AND THOMAS BELL, OF

HUGHES, INDIAN TERRITORY.

OPERATING MECHANISM FOR SCREENS.

Specification of Letters Patent.

Patented Dec. 19, 1905.

Application filed February 10, 1905. Serial No. 245,127.

To all whon t it may concern.-

Be it known that we, JOHN E. LEBOSQUET, residing at South McAlester, andTHoMAs BELL, residing at Hughes, in Choctaw Nation, in the IndianTerritory, citizens of the United States, have invented certain new anduseful Improvements in Operating Mechanism for Screens, of which thefollowing is a specification.

Our invention relates to devices for operating screens for coal, ore,&c., and has for its object the provision of simply-constructedmechanism for actuating screens that will replace the eccentrics ingeneral use and be more effective in their operation.

Our invention will be particularly described hereinafter and illustratedin the accompanying drawings, in which- Figure 1 is a side View of ascreen, showing our operating mechanism in position; Fig. 2, a viewillustrating the mechanism used for transmitting power when theengine-cylinder is not on the same plane as the ends of the screens, andFig. 3 a View showing the operating-shaft and cranks thereof.

In the drawings similar reference characters indicate correspondingparts throughout the several views.

A represents a suitable frame, and B screens suspended in the frame.

D represents a steam-engine cylinder; E, a piston in said cylinder; F,the piston-rod, and G the cross-head.

H represents a shaft suitably journaled, and I a link connecting thecross-head G and a crank in said shaft H.

J represents a wheel or crank-disk secured to shaft H.

K represents a shaft journaled in boxes L on cross-beams M on frame A,having a crank N secured thereto and connected with wheel or disk J bymeans of a rod or link O.

P represents double-ended cranks secured to shaft K, and W and R rodsconnecting screens B and C, respectively, with said doubleended cranks.

In experimenting with our invention we have found that there was a greatdeal of lost motion and consequent jarring ofthe framework of themachine, and to overcome this we mount a block S on each side of the endof one screen B, having a coil-spring s secured to each block and sopositioned that the other screen B strikes them when the screensapproach each other, and an arm T, secured to the framework A, having acoil-spring z? secured thereto and so positioned that the crank Nstrikes it when at the extremity of its stroke. It will be seen by thisconstruction that when the screens are drawn apart the crank strikes thespring t, while when the screens come together the springs s on onescreen intercept the end of the other screen, so that the extremity ofeach stroke of the rod O is cushioned and the jerking and jarringincident to the end of rod O passing the dead-centers of wheel or disk Javoided.

The operation of our invention is as follows: When steam is turned intoD, causing the piston to reciprocate, the cross-head G imparts arotatory motion to shaft H by means of link I. The shaft K is given arocking motion by means of crank N and rod or link O. The double-endedcranksP then through rods Q and R impart a shaking motion to thescreens.

In Fig. 2 the cylinder D is not on the same plane as the ends of thescreens B and O. In such case instead of one shaft K two shafts areprovided, (designated in said Fig. 2 by the characters k and 7d,) thecrank N being secured to is, while the double-ended cranks P are securedto shaft the two shafts being connected by means of double-ended cranksU and V secured to the shafts 7i and 70, re-

spectively, and connected by rods W.

Having thus described our invention, what we claim is 1. In combinationwith a frame and two shaking screens mounted therein, springs secured toone screen and so positioned as to be struck by theother screen, a shaftsuitably journaled on the frame, double-ended cranks secured to saidshaft, rods connecting one end of said cranks with one screen, rodsconnecting the other end of said cranks with the other screen, a cranksecured to the end of said shaft, means to oscillate said crank, and aspring-buffer mounted on the frame to engage the crank at the extremityof its stroke, substantially as shown and described.

2. In combination with a frame and two shaking screens mounted therein,springs secured to one screen and so positioned as to be struck by theother screen, a shaft suitably journaled on the frame, double-endedcranks secured to said shaft, rods connecting one end of said crankswith one screen, rods connecting the other end of said cranks With theother I extremity of its stroke, substantially as shown I screen, anengine-cylinder, a cross-head driven and described.

by the piston in said cylinder, a drive-shaft In testimony whereof Wehereto aflix oursigsuitably journaled and driven by said crossnatures inthe presence of two Witnesses.

head, a Wheel or disk secured to said drive- JOHN E. LEBOSQUET. shaft, acrank secured to the shaft journaled THOMAS BELL.

on the frame, a link connecting said Wheel or Witnesses: disk and saidcrank, andaspring-bufifer mount- W. O. JONES, ed on the frame to engagethe crank at the l S. F. PRICE.

